Damper/shock absorber forces

[Ozone]

Ueno - thanks for your observations. I've not driven my 86 much since it landed in the UK so I'm still getting a feel for it.
Have you measured the total stroke of the Greddys? So far I just measured rebound stroke on the front at recommend setting - 22mm!
Nohachi - remember I said I want to make sure I had no errors before posting spreadsheets? Well I had not accounted for the unsprung mass so that is why my frequencies are a little on the low side. I used 920kg kerb mass with 58.7% on the front (can't remember how I worked that out) and also added driver + passenger mass (75kg each) 50% along wheelbase. So total mass used is 615kg front and 455kg rear. If I use an unsprung mass of 50kg front and 65kg rear (rough guess) the rates come out as 2.59hz front and 2.6hz rear.
The lever ratios I've used are 0.98 front (experience, not calculated but 0.99 may be closer), 1.0 rear ride and 0.69 rear roll.
I also include a small rate due to suspension bushes - 2.5N/mm front and 3N/mm rear, based on a little experience.